Jahi McMath, a 13-year-old girl who was declared brain dead after complications from tonsil surgery, is improving after being given feeding and breathing tubes in her new facility, her family attorney said.

"She is doing very well and now getting the treatment she should have gotten 28 days ago," attorney Christopher Dolan tweeted. Dolan revealed Monday that Jahi's body had deteriorated upon her being transfered from Oakland Children's Hospital on Sunday. "We don't know if she's going to make it," he said according to the Los Angeles Times. Her location has not been made public.

A California judge ruled that the hospital had permission to take Jahi off life support on Dec. 24, but her family appealed the decision. The Oakland coroner issued her death certificate for Dec. 12.

What was supposed to be a simple procedure ended with complications. Jahi was admitted to Children’s Hospital & Research Center Oakland on Dec. 9 to have her tonsils removed and began bleeding profusely after the surgery. She then went into cardiac arrest.

In a statement, the Children's hospital said despite criticism from the family's lawyer, they supported the family's decision to move Jahi. Doctors say Jahi’s condition is irreversible.

"The medical team and I believe that additional and more dramatic signs of the body's deterioration will continue to manifest over time, regardless of any procedures and regardless of any heroic measures that any facility in the country might attempt," Flori said in the declaration filed in U.S. District Court.

Jahi's mother Nailah Winkfield wrote in an open letter in December 2013 that she believes God will eventually “spark her brain awake.”   

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Follow Natelege Whaley on Twitter: @Natelege.

(Photo: BECK DIEFENBACH/LANDOV)